216566488841 has 4 divisors (see below), whose sum is σ = 216684768384. Its totient is φ = 216448209300.

The previous prime is 216566488829. The next prime is 216566488843. The reversal of 216566488841 is 148884665612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216566488841 - 2³⁴ = 199386619657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216566488843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59137025 + ... + 59140686.

It is an arithmetic number, because the mean of its divisors is an integer number (54171192096).

Almost surely, 2^216566488841 is an apocalyptic number.

It is an amenable number.

216566488841 is a deficient number, since it is larger than the sum of its proper divisors (118279543).

216566488841 is a wasteful number, since it uses less digits than its factorization.

216566488841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118279542.

The product of its digits is 17694720, while the sum is 59.

The spelling of 216566488841 in words is "two hundred sixteen billion, five hundred sixty-six million, four hundred eighty-eight thousand, eight hundred forty-one".